Fatal error: Uncaught Error: Class "JMS\Serializer\Annotation\XmlCollection" not found in /var/www/html/src/vendor/jms/serializer/src/Annotation/XmlMap.php:12 Stack trace: #0 {main} thrown in /var/www/html/src/vendor/jms/serializer/src/Annotation/XmlMap.php on line 12